FA-44142 / Borrow checking / Member archive

A one-shot continuation can be resumed twice · case 02

A one-shot continuation can be resumed twice.

Member previewVariant 2 · 3 implementations · 21 checks per implementation

Case contract

Check a one-shot continuation calculus with borrowed captures. A continuation resumes at most once; abort releases captures; escaping continuation may not borrow its capturing stack; cloning continuation cannot duplicate unique captures; resumption restores suspended loans; captured owner must survive resumed body; continuation argument ownership is transferred once; nested handler cannot release outer captures; unwound continuation invalidates frame-local reference results; resumed result origin must be among the continuation declared return origins. Input is a fully explicit descriptor of the stated toy IR. Return rule identifiers in declaration order; absent optional obligations use the provided neutral defaults. No rule is an assertion about a production language.

Why this case matters

A finite offline static-analysis model of ownership and borrowing; it does not execute the analyzed program.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
one-shot-resume regression 0	`[]`	`["one-shot-resume"]`	Failed

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